The present invention relates to compositions comprising silicone-in-water emulsions and fragrance compositions. It also relates to hair care preparations comprising such compositions, which provide improved release of fragrance when applied to the hair and improved deposition of the fragrance on the hair. The invention is further related to methods of cleansing hair, which comprises applying a hair care preparation to the hair.

Silicone-in-water emulsions are well known for use in cosmetic preparations. Hair care preparations with silicone-in-water emulsions have been described, for example, in WO200203936, EP1093809, and WO200139735. Silicone is lubricious and acts to enhance the properties of the hair by improving the feel, the shine, and the ease of combing the hair. These compositions may also include fragrances, which are intended to be released during the application of the composition and, preferably, be deposited onto the hair for subsequent release. There is, however, still a need for hair care preparations that can provide improved deposition of fragrances or at least a deposition that will result in a longer lasting release of fragrance from the hair, without losing the favorable sensory and aesthetic performance qualities of the product.

It has now surprisingly been found that if an emulsion of a silicone polymer of certain minimum viscosity is introduced in combination with certain fragrances in the cosmetic preparation, better deposition of the fragrance can be achieved without any loss of the essential properties of hair care preparations. The better deposition particularly occurs upon joint introduction of the silicone polymer and the fragrance composition in a single emulsion composition.

WO 02/062311 A (combined with EP-A-0 874 017 internally referred to) and WO 01/58986 both disclose compositions containing a fragrance and a S/W-emulsion comprising a surfactant, wherein the silicone has a viscosity of 100 millions mm²/s or more and a particle size of 2 microns or less.

There is provided a composition comprising: i) a fragrance composition, wherein the fragrance composition comprises a) at least 10.0% by weight of a fragrance composition of one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of less than 3.0; b) at least 15% by weight of a fragrance composition of a one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of 3.0 or more; and c) at least 20% by weight of a fragrance composition of one or more perfume ingredients have a boiling point of greater than 250 °C; and ii) a silicone-in-water emulsion comprising at least one surfactant wherein the dispersed silicone has a viscosity of 100 million mm²s^-1 or more and a particle size of less than 2 µm.

The invention is directed, in an aspect, to a method of cleansing hair, which comprises applying to the hair a hair care preparation comprising: the above composition.

The silicone-in-water emulsion used in the present invention may be prepared by emulsion polymerisation methods well-known in the art, such as those described in U.S. 5,998,537 and EP 0874017. In summary, this method comprises a) mixing materials comprising a composition containing at least one polysiloxane, at least one organosilicon material that reacts with the polysiloxane by a chain extension reaction, a metal containing catalyst for said chain extension reaction, at least one surfactant, and water to form a mixture, and b) emulsifying the mixture. This method provides a route to silicone-in-water emulsions having a wide range of physical characteristics, in particular emulsions wherein the dispersed silicone has a high viscosity and low droplet size.

Chain extension reactions with polysiloxanes are known in the art and can involve, for instance, the hydrosilylation reaction in which an Si-H reacts with an aliphatically unsaturated group in the presence of a platinum or rhodium-containing catalyst forming polysiloxanes having some Si-(C)_p-Si links (wherein p = 1-6), which polysiloxanes may also be referred to as polysiloxane polysilalkylene copolymers. Alternatively, the chain extension reaction can involve the reaction of an Si-OH group (e.g., a hydroxy-terminated polysiloxane) with an alkoxy group (e.g., alkoxysilanes, silicates, or alkoxysiloxanes) in the presence of a metal containing catalyst forming polysiloxane materials.

The polysiloxanes used in the chain extension reactions described above generally comprise a substantially linear polymer of the structure (I): In this structure, each R independently represents a hydrocarbon group having up to 20 carbon atoms, preferably 1 to 6 carbon atoms, such as an alkyl group (e.g., methyl, ethyl, propyl or butyl), an aryl group (e.g., phenyl), or the group required for the chain extension reaction described above ("reactive group", e.g., silicon-bonded hydrogen atoms, aliphatically unsaturated groups such as vinyl, allyl or hexenyl, hydroxy, alkoxy such as methoxy, ethoxy or propoxy, alkoxy-alkoxy, acetoxy, amino and the like), provided that on average there is from one to two reactive groups (inclusive) per polymer, and n is a positive integer greater than one. Preferably, a majority, more preferably >90%, and most preferably >98% of the reactive groups are substituted on the terminal silicone atom in the siloxane. Preferably, n is an integer which results in polysiloxanes with viscosities between about 1 and about 1 million mm²s^-1, preferably from 1000 to 100,000 mm²s^-1.

The polysiloxane (I) can have a small amount of branching (e.g., less than 2 mole % of the siloxane units), but preferably, wherein the polymers are substantially linear, more preferably completely linear. Moreover, the R groups can be substituted with, for example, nitrogen containing groups (e.g., amino groups), epoxy groups, sulfur-containing groups, silicon-containing groups, oxygen-containing groups and the like. Preferably, however, at least 80% of the R groups are alkyl and, more preferably, the alkyl groups are methyl groups.

The organosilicon material that reacts with the polysiloxane by a chain extension reaction can be either a second polysiloxane or a material which acts as a chain extension agent. If the organosilicon material is a polysiloxane, then it too will generally have the structure described above (I). In such a situation, one polysiloxane in the reaction will comprise one reactive group and the second polysiloxane will comprise a second reactive group that reacts with the first.

If the organosilicon material comprises a chain extension agent, it can be a material such as a silane, a siloxane (e.g., disiloxane or trisiloxane) or a silazane. For example, a composition comprising a polysiloxane according to the above structure (I) which has at least one Si-OH group can be chain extended by using an alkoxysilane (e.g., a dialkoxysilane or trialkoxysilane) in the presence of a tin or titanium containing catalyst.

The metal containing catalysts used in the above described chain extension reactions are often specific to the particular reaction. Such catalysts, however, are known in the art. Generally, they are materials containing metals such as platinum, rhodium, tin, titanium, copper, lead, etc.

In a preferred chain-extension reaction, a polysiloxane having at least one aliphatically unsaturated group, preferably an end-group, is reacted with an organosilicon material that is a siloxane or a polysiloxane having at least one Si-H group, preferably an end group, in the presence of a hydrosilylation catalyst. The polysiloxane having at least one aliphatically unsaturated group has the structure (I) wherein R and n are as defined above and provided that on average between one and two (inclusive) R groups comprise an aliphatically unsaturated group per polymer. Representative aliphatically unsaturated groups include vinyl, allyl, hexenyl and cyclohexenyl or a group R²CH=CHR³, where R² represents a divalent aliphatic chain linked to the silicon atom and R³ represents a hydrogen atom or an alkyl group. The organosilicon material having at least one Si-H group preferably has the above structure (I) wherein R and n are as defined above and provided that on average between one and two (inclusive) R groups comprise hydrogen atoms and n is 0 or a positive integer. This material can be a polymer or a lower molecular weight material such as a siloxane (e.g. a disiloxane or a trisiloxane).

The polysiloxane having at least one aliphatically unsaturated group and the organosilicon material having at least one Si-H group react in the presence of a hydrosilylation catalyst. Such catalysts are known in the art and include, for example, platinum and rhodium-containing materials. These catalysts may take any of the known forms, such as platinum or rhodium deposited on carriers such as silica gel or powdered charcoal, or other appropriate compounds such as platinic chloride, salts of platinum and chloroplatinic acids. A preferred material is chloroplatinic acid either as the commonly obtainable hexahydrate or the anhydrous form because of its easy dispersibility in organosilicon systems and its non-effect on colour of the mixture. Platinum or rhodium complexes may also be used, for example those prepared from chloroplatinic acid hexahydrate and divinyltetramethyldisiloxane. Generally, these catalysts are used in amounts of between about 0.0001 and 10 wt. % based on the weight of the composition (I).

In a second preferred chain extension reaction, a polysiloxane having at least one Si-OH group, preferably an end group, is reacted with an organosilicon material having at least one alkoxy group, preferably a siloxane having at least one Si-OR group, or an alkoxysilane having at least two alkoxy groups in the presence of a metal containing catalyst. In this case, the polysiloxane having at least one SiOH group has the structure (I) wherein R and n are as defined above and on average between one and two (inclusive) R groups comprise a hydroxyl group (OH). The organosilicon material having at least one alkoxy group can have the structure (I) wherein R and n are as defined above and on average between one and two (inclusive) R groups comprise alkoxy groups, e.g., of the structure (OR) in which R is as defined above and n is 0 or a positive integer. Alternatively, the organosilicon material can be a silane of the structure R_mSi(OR)_4-m, wherein R is as defined above and m is 0 to 2. Other materials containing the alkoxy group (e.g., alkoxy- alkoxy) may also be used.

A variety of metal catalysts for the reaction of an Si-OH group with an Si-OR group are known in the art and may be employed including, for example, organic metal compounds such as organotin salts, titanates, or titanium chelates or complexes. Examples include stannous octoate, dibutyltin dilaurate, dibutyltin diacetate, dimethyltin dineodecanoate, dibutyltin dimethoxide, isobutyl tin triceroate, dimethyltin dibutyrate, dimethyltin dineodecanoate, triethyltin tartrate, tin oleate, tin naphthenate, tin butyrate, tin acetate, tin benzoate, tin sebacate, tin succinate, tetrabutyl titanate, tetraisopropyl titante, tetraphenyl titante, tetraoctadecyl titanate, titanium naphthanate, ethyltriethanolamine titante, titanium diiso-propyl diethyl acetoacetate, titanium diisopropoxy diacetyl acetonate, and titanium tetra alkoxides where the alkoxide is butoxy or propoxy. Generally, these catalysts are used in amounts of between about 0.001 and 10 wt. % based on the weight of the composition (I).

Any composition containing at least one polysiloxane, at least one organosilicon material which reacts with said polysiloxane by a chain extension reaction, and a metal containing catalyst for said chain extension reaction can be used for the chain extension reaction.

The dispersed silicone in the emulsion used in the present invention has a viscosity of 100 million mm²s^-1 or more, more preferably 150 million mm²s^-1 or more, and most preferably 170 million mm²s^-1 or more, and a particle size of 2 µm ore less, more preferably 1 µm or less, and most preferably 0.5 µm or less. (Viscosities are measured at 25°C and atmospheric pressure.) It is also a preferred option that the particle size is small enough to cause the emulsion to be a microemulsion.

The emulsion preferably comprises at least 50% wt. silicone, more preferably at least 60 wt. %, even more preferably 75 wt. %. In addition to the polymerised silicone, the emulsion may also contain up to 2.5% by weight, based on the total weight of silicone, of a volatile silicone, which is mainly selected from cyclic siloxanes, preferably dimethyl cyclo polysiloxanes, and short chain polysiloxanes, preferably polydimethyl siloxanes with a chain length of no more than 10 siloxane units.

The preferred silicone-in-water emulsions of the invention are non-ionic and the silicone is a linear polysiloxane polysilalkylene copolymer, wherein the monovalent silicone substituents are substantially all C_1-6 hydrocarbon groups and the copolymer has a viscosity of 150 million mm²s^-1 or more and a particle size of 1 µm or less. In a more preferred embodiment, the silicone-in-water emulsion is a non-ionic emulsion comprising about 60 % by weight of a linear silicone copolymer formed by the hydrosilylation of a Si-H end-blocked polydimethyl siloxane and a vinyl-end-blocked polydimethyl siloxane, wherein the copolymer has a viscosity of about 170 mm²s^-1 and a particle size of about 0.5 µm, and about 5 % by weight of non-ionic surfactants.

The mixture used to form the emulsion also contains at least one surfactant. This can be a non-ionic surfactant, a cationic surfactant, an anionic surfactant, alkylpolysaccharides, amphoteric surfactants and the like.

Examples of non-ionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkeylene sorbitan alkyl esters, polyoxyalkylene alkyl esters, and polyoxyalkylene alkylphenol ethers, polyethylene glycols, polypropylene glycols, and diethylene glycols. Particular examples include BRIJ35 and BRIJ30 (ICI Chemicals).

Examples of cationic surfactants include quaternary ammonium hydroxides such as tetramethylammonium hydroxide, octyltrimethylammonium hydroxide, dodecyl-trimethyl ammonium hydroxide, hexadecyltrimethyl ammonium hydroxide, octyldimethylbenzylammonium hydroxide, decyldimethylbenzyl ammonium hydroxide, didodecyldimethyl ammonium hydroxide, dioctadecyl dimethylammonium hydroxide, tallow trimethylammonium hydroxide and cocotrimethylammonium hydroxide as well as corresponding salts of these materials, fatty acid amines and amides and their derivatives and the salts of the fatty acid amines and amides including aliphatic fatty amines and their derivatives, homologs of aromatic amines having fatty chains, fatty amides derived from aliphatic diamines, fatty amides derived from disubstituted amines, derivatives of ethylene diamine, amide derivatives of amino alcohols, amine salts of long chain fatty acids, quaternary ammonium bases derived from fatty amides of disubstituted diamines quaternary ammonium bases of benzimidazolines, basic compounds of pyridinium and its derivatives, sulfonium compounds, quaternary ammonium compounds of betaine, urethanes of ethylene diamine, polyethylene diamines and polypropanolpolyethanol amines.

Examples of suitable anionic surfactants include alkyl sulfates such as lauryl sulfate, polymers such as acrylates/C_10-30 alkyl acrylate crosspolymer alkylbenzenesulfonic acids and salts such as hexylbenzenesulfonic acid, octylbenzenesulfonic acid, decylbenzenesulfonic acid, dodecylbenzenesulfonic acid, cetylbenzenesulfonic acid and myristylbenzenesulfonic acid; the sulfate esters of monoalkyl polyoxyethylene ethers; alkylnapthylsulfonic acid; alkali metal sulforecinates, sulfonated glyceryl esters of fatty acids such as sulfonated monoglycerides of coconut oil acids, salts of sulfonated monovalent alcohol esters, amides of amino sulfonic acids, sulfonated products of fatty acid nitriles, sulfonated aromatic hydrocarbons, condensation products of naphthalene sulfonic acids with formaldehyde, sodium octahydroanthracene sulfonate, alkali metal alkyl sulfates, ester sulfates, and alkarylsulfonates.

Examples of suitable alkylpolysaccharides include, for example, materials of the structure R¹-O-(R²O)_x-(G)_y wherein R¹ represents a linear or branched alkyl group, a linear or branched alkenyl group or an alkylphenyl group, R² represent an alkylene group, G represents a reduced sugar, x denotes 0 or a positive integer and y denotes a positive integer as described, for example, in US Patent 5,035,832, incorporated herein by reference.

Examples of suitable amphoteric surfactants include cocamidopropyl betaine and cocamidopropyl hydroxysulfate.

The above surfactants may be used individually or in combination.

The fragrances of the present invention comprise a) at least 10.0% by weight of the fragrance composition of one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of less than 3.0; b) at least 15% by weight of the fragrance composition of one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of 3.0 or more, and c) at least 20% by weight of the fragrance composition of one or more perfume ingredients have a boiling point of greater than 250 °C. Examples of these three classes of perfume ingredients are illustrated in Tables 1-3. The specific ingredients in these Tables are illustrative only and other materials familiar to those skilled in the art that fall within the guidelines above can also be incorporated into the fragrance compositions of the present invention.

The fragrance compositions of the invention preferably comprise at least 20.0% by weight of the fragrance composition of one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of less than 3.0; at least 15% by weight of the fragrance composition of a one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of 3.0 or more; and at least 30% by weight of the fragrance composition of one or more perfume ingredients have a boiling point of greater than 250 °C. The fragrances compositions of the invention more preferably comprise: a) 30.0 to 40.0 % by weight of the fragrance composition of one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of less than 3.0; b) 20.0 to 25.0 % by weight of the fragrance composition of one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of 3.0 or more; and c) 40.0 to 45.0 % by weight of the fragrance composition of one or more perfume ingredients have a boiling point of greater than 250 °C.

The fragrance compositions of the invention include as examples, but are not limited to fragrance 890656 and fragrance 862883. Fragrance 890656 comprises a) 31.03 % by weight of the fragrance composition of one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of less than 3.0; b) 20.17 % by weight of the fragrance composition of a one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of 3.0 or more; and c) 44.91 % by weight of the fragrance composition of one or more perfume ingredients have a boiling point of greater than 250 °C. Fragrance 890656 comprises 12.79 % Di propylene glycol; 12.00 % Linalyl acetate; 9.00 % Hexyl cinnamic aldehyde; 7.50 % Tonalide; 7.38 % Benzyl salicylate; 6.05% Phenyl ethyl alcohol; 4.89 % Linalool; 4.50 % Vertenex; 10.01 % apple base; 4.93 % ozonic base; 9.84 % woody base; 10.61 % floral base; and .50 % oils or resins. Apple base, ozonic base, woody base, and floral base are fragrances comprising one or more perfume ingredients that have the combined indicated characteristic. Fragrance 890656 has the fragrance description of citrus, green, lemon, melon, apple, woody, jasmin, herbal, peach, muguet, and musk.

Fragrance 862883 comprises a) 34.08 % by weight of the fragrance composition of one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of less than 3.0; b) 23.10 % by weight of the fragrance composition of a one or more perfume ingredients having a boiling point of 250 °C or less and ClogP of 3.0 or more; and c) 42.46 % by weight of the fragrance composition of one or more perfume ingredients have a boiling point of greater than 250 °C. Fragrance 862883 comprises 18.98 % Di propylene glycol; 7.35 Verdox; 4.48 % Hedion; 4.47 % Linalool; 4.30 % Benzyl salicylate; 4.23 % Methyl hydrocinnamic aldehyde; 4.06 % Dihydro myrcenol; 4.25 % Citrus oil; 3.56 % Benzyl acetate; 3.27 % Hexyl cinnamic aldehyde; 2.04 % Benzyl Benzoate; 1.36 % Linalyl acetate; 18.12 % apple base; 5.07 % floral sandelwood base; 4.91 % fruit base; 5.77 % green base; and 3.78 % oils or resins. Apple base, floral sandelwood base, fruit base, and green base are fragrances comprising one or more perfume ingredients that have the combined indicated characteristic. Fragrance 862883 has the fragrance description of apple blossom, fruity, apple, floral, sandalwood, and musk.

The boiling points (BP) of many perfume ingredients, at standard 760 mmHg are given in, e.g., "Perfume and Flavor Chemicals (Aroma Chemicals)," Steffen Arctander, published by the author, 1969. The octanol/water partition coefficient of a fragrance ingredient is the ratio between its equilibrium concentrations in octanol and in water. The partition coefficients of the preferred perfume ingredients of the present invention may be more conveniently given in the form of their logarithm to the base 10, logP. The logP values of many perfume ingredients have been reported; for example, the Pomona92 database, available from Daylight Chemical Information Systems, Inc. (Daylight CIS), Irvine, Calif., contains many, along with citations to the original literature. However, the logP values are most conveniently calculated by the "CLOGP" program, also available from Daylight CIS. This program also lists experimental logP values when they are available in the Pomona database. The "calculated logP" (ClogP) is determined by the fragment approach of Hansch and Leo (cf., A. Leo, in Comprehensive Medicinal Chemistry, Vol. 4, C. Hansch, P. G. Sammens, J. B. Taylor and C. A. Ramsden, Eds., p. 295, Pergamon Press, 1990. The fragment approach is based on the chemical structure of each perfume ingredient, and takes into account the numbers and types of atoms, the atom connectivity, and chemical bonding. The ClogP values, which represent the octanol/water partition coefficient of a fragrance ingredient, are the most reliable and widely used estimates for this physicochemical property and are preferably used instead of the experimental logP values in the selection of perfume ingredients which are useful in the present invention. Name BP CLogP Allyl Caproate 185 2.772 Amyl Acetate 142 2.258 Amyl Propionate 161 2.657 Anisic Aldehyde 248 1.779 Anisole 154 2.061 Benzaldehyde 179 1.480 Benzyl Acetate 215 1.960 Benzyl Acetone 235 1.739 Benzyl Alcohol 205 1.100 Benzyl Formate 202 1.414 Benzyl Iso Valerate 246 2.887 Benzyl Propionate 222 2.489 Beta Gamma Hexenol 157 1.337 Camphor Gum 208 2.117 laevo-Carveol 227 2.265 d-Carvone 231 2.010 laevo-Carvone 230 2.203 Cinnamyl Formate 250 1.908 cis-Jasmone 248 2.712 cis-3-Hexenyl Acetate 169 2.243 Cuminic alcohol 248 2.531 Cuminic aldehyde 236 2.780 Cyclal C 180 2.301 Dimethyl Benzyl Carbinol 215 1.891 Dimethyl Benzyl Carbinyl Acetate 250 2.797 Ethyl Acetate 77 0.730 Ethyl Aceto Acetate 181 0.333 Ethyl Amyl Ketone 167 2.307 Ethyl Benzoate 212 2.640 Ethyl Butyrate 121 1.729 Ethyl Hexyl Ketone 190 2.916 Ethyl-2-methyl butyrate 131 2.100 Ethyl Methyl Pentanoate 143 2.700 Ethyl Phenyl Acetate 229 2.489 Eucalyptol 176 2.756 Fenchyl Alcohol 200 2.579 Flor Acetate (tricyclo Decenyl Acetate) 175 2.357 Frutene (tricyclo Decenyl Propionate) 200 2.260 Geraniol 230 2.649 Hexenol 159 1.397 Hexenyl Acetate 168 2.343 Hexyl Acetate 172 2.787 Hexyl Formate 155 2.381 Hydratropic Alcohol 219 1.582 Hydroxycitronellal 241 1.541 Isoamyl Alcohol 132 1.222 Isomenthone 210 2.831 Isopulegyl Acetate 239 2.100 Isoquinoline 243 2.080 Ligustral 177 2.301 Linalool 198 2.429 Linalool Oxide 188 1.575 Linalyl Formate 202 2.929 Menthone 207 2.650 Methyl Acetophenone 228 2.080 Methyl Amyl Ketone 152 1.848 Methyl Anthranilate 237 2.024 Methyl Benzoate 200 2.111 Methyl Benzyl Acetate 213 2.300 Methyl Eugenol 249 2.783 Methyl Heptenone 174 1.703 Methyl Heptine Carbonate 217 2.528 Methyl Heptyl Ketone 194 1.823 Methyl Hexyl Ketone 173 2.377 Methyl Phenyl Carbinyl Acetate 214 2.269 Methyl Salicylate 223 1.960 Nerol 227 2.649 Octalactone 230 2.203 Octyl Alcohol (Octanol-2) 179 2.719 para-Cresol 202 1.000 para-Cresyl Methyl Ether 176 2.560 para-Methyl Acetophenone 228 2.080 Phenoxy Ethanol 245 1.188 Phenyl Acetaldehyde 195 1.780 Phenyl Ethyl Acetate 232 2.129 Phenyl Ethyl Alcohol 220 1.183 Phenyl Ethyl Dimethyl Carbinol 238 2.420 Prenyl Acetate 155 1.684 Propyl Butyrate 143 2.210 Pulegone 224 2.350 Rose Oxide 182 2.896 Safrole 234 1.870 4-Terpinenol 212 2.749 alpha-Terpineol 219 2.569 Viridine 221 1.293 Name BP CLogP Zallo-Ocimene 192 4.362 Allyl Heptoate 210 3.301 Anethol 236 3.314 Benzyl Butyrate 240 3.698 Camphene 159 4.192 Carvacrol 238 3.401 cis-3-Hexenyl Tiglate 101 3.700 Citral (Neral) 228 3.120 Citronellol 225 3.193 Citronellyl Acetate 229 3.670 Citronellyl Isobutyrate 249 4.937 Citronellyl Nitrile 225 3.094 Citronellyl Propionate 242 4.628 Cyclohexyl Ethyl Acetate 187 3.321 Decyl Aldehyde 209 4.008 Delta Damascone 242 3.600 Dihydro Myrcenol 208 3.030 Dihydromyrcenyl Acetate 225 3.879 Dimethyl Octanol 213 3.737 Fenchyl Acetate 220 3.485 gamma Methyl Ionone 230 4.089 gamma-Nonalactone 243 3.140 Geranyl Acetate 245 3.715 Geranyl Formate 216 3.269 Geranyl Isobutyrate 245 4.393 Oeranyl Nitrile 222 3.139 Hexenyl Isobutyrate 182 3.181 Hexyl Neopentanoate 224 4.374 Hexyl Tiglate 231 3.800 alpha-Ionone 237 3.381 beta-Ionone 239 3.960 gamma-Ionone 240 3.780 alpha-Irone 250 3.820 Isobornyl Acetate 227 3.485 Isobutyl Benzoate 242 3.028 Isononyl Acetate 200 3.984 Isononyl Alcohol 194 3.078 Isomenthol 219 3.030 para-Isopropyl Phenylacetaldehyde 243 3.211 Isopulegol 212 3.330 Lauric Aldehyde (Dodecanal) 249 5.066 d-Limonene 177 4.232 Linalyl Acetate 220 3.500 Menthyl Acetate 227 3.210 Methyl Chavicol 216 3.074 alpha-iso "gamma" Methyl Ionone 230 4.209 Methyl Nonyl Acetaldehyde 232 4.846 Methyl Octyl Acetaldehyde 228 4.317 Myrcene 167 4.272 Neral 228 3.320 Neryl Acetate 231 3.555 Nonyl Acetate 212 4.374 Nonyl Aldehyde 212 3.479 Octyl Aldehyde 223 3.845 Orange Terpenes (d-Limonene) 177 4.232 para-Cymene 179 4.068 Phenyl Ethyl Isobutyrate 250 3.000 alpha-Pinene 157 4.122 beta-Pinene 166 4.182 alpha-Terpinene 176 4.412 gamma-Terpinene 183 4.232 Terpinolene 184 4.232 Terpinyl acetate 220 3.475 Tetrahydro Linalool 191 3.517 Tetrahydro Myrcenol 208 3.517 Undecenal 223 4.053 Veratrol 206 3.140 Verdox 221 4.059 Vertenex 232 4.060 Name BP CLogP Allyl Cyclohexane Propionate 267 3.935 Ambrettolide 300 6.261 Amyl Benzoate 262 3.417 Amyl Cinnamate 310 3.771 Amyl Cinnamic Aldehyde 285 4.324 Amyl Cinnamic Aldehyde Dimethyl Acetal 300 4.033 iso-Amyl Salicylate 277 4.601 Aurantiol 450 4.216 Benzophenone 306 3.120 Benzyl Salicylate 300 4.383 Cadinene 275 7.346 Cedrol 291 4.530 Cedryl Acetate 303 5.436 Cinnamyl Cinnamate 370 5.480 Coumarin 291 1.412 Cyclohexyl Salicylate 304 5.265 Cyclamen Aldehyde 270 3.680 Dihydro Isojasmonate 300 3.009 Diphenyl Methane 262 4.059 Ethylene Brassylate 332 4.554 Ethyl Methyl Phenyl Glycidate 260 3.165 Ethyl Undecylenate 264 4.888 iso-Eugenol 266 2.547 Exaltolide 280 5.346 Galaxolide 260 5.482 Oeranyl Anthranilate 312 4.216 Hexadecanolide 294 6.805 Hexenyl Salicylate 271 4.716 Hexyl Cinnamic Aldehyde 305 5.473 Hexyl Salicylate 290 5.260 Linalyl Benzoate 263 5.233 2-Methoxy Naphthalene 275 3.235 Methyl Cinnamate 263 2.620 Methyl Dihydrojasmonate 300 2.275 beta-Methyl Naphthyl ketone 300 2.275 Musk Indanone >250 5.458 Musk Ketone 137 (MP) 3.014 Musk Tibetine 136 (MP) 3.831 Myristicin 276 3.200 delta-Nonalactone 280 2.760 Oxahexadecanolide-10 300 4.336 Oxahexadecanolide-11 35 (MP) 4.336 Patchouli Alcohol 285 4.530 Phantolide 288 5.977 Phenyl Ethyl Benzoate 300 4.058 Phenylethylphenylacetate 325 3.767 alpha-Santalol 301 3.800 Thibetolide 280 6.246 delta-Undecalactone 290 3.830 gamma-Undecalacto ne 297 4.140 Vanillin 285 1.580 Vetiveryl Acetate 285 4.882 Yara-Yara 274 3.235

The silicone-in-water emulsion, wherein the dispersed silicone has a viscosity of at least, and preferably more than 100 million mm²s^-1, and a particle size of at most, preferably less than 2 µm, is mixed with a fragrance composition in a weight ratio of preferably from 1:1 to 10:1 1 of silicone:fragrance. It is preferred that this mixing takes place prior to incorporation in a hair care preparation, as it enables a greater control and consistency of the distribution and partitioning of the silicone and the fragrance in the hair care preparation. Mixing may take place by methods well-known in the art. For example, low shear mixing may take place by methods well-known in the art, as for example, regular hand mixing using low shear bench scale overhead mixing equipment, as for example a Heidolf RZR 50 stirrer with variable speed range between 45-2000 RPM, or on a larger scale in a groin kettle or via large scale overhead mechanical drum mixing.

The mixture is then incorporated in a hair care preparation in an amount which provides at least 1% silicone by weight of the hair care preparation, for example 1 to 10% by weight, or for example 2 to 6% wt. Hair care preparations, including shampoos, conditioners and conditioning shampoos are well known in the art, and typically comprise a washing base containing surfactants, and other agents for improving the cosmetic properties of the preparation. The washing base typically comprises a cosmetically acceptable aqueous medium, which may be solely water, or water with a solvent (for example, a lower alcohol or alkylene glycol). The surfactants may be anionic, non-ionic, cationic, or amphoteric. Other additives which may be included in the preparation include pH adjusters (for example, amines), viscosity regulators, electrolytes or thickeners, pearlising or opacifying agents, foam synergists, and other agents for improving the properties of the preparation, for example anionic, non-ionic and cationic polymers, proteins, fatty acids and vitamins. The hair care preparation will typically be in the form of a liquid, a thickened liquid, a lotion or a gel.

The use of the above defined silicone-in-water emulsion in hair care preparations according to the present invention can provide hair care preparations which have improved fragrance deposition on hair, measured as longer lasting fragrance release from the hair compared to conventional preparations. The improved fragrance deposition occurs without a loss of favorable sensory and aesthetic perception for the user normally associated with silicone deposition on hair, which includes ease of combing, luster, shine and general conditioning.

It is particularly surprising that the combination of such high viscosity of the emulsified silicones with such low particle size results in the greater deposition of the fragrance or a longer lasting release of the fragrance from the hair, without negatively affecting the benefits of deposited silicones.

The invention is directed to a method of cleansing hair, which comprises applying to the hair a hair care preparation comprising: i) a fragrance composition; and ii) a silicone-in-water emulsion comprising at least one surfactant, wherein the dispersed silicone has a viscosity of 100 million mm²s^-1 or more and a particle size of less than 2 µm.

In a preferred embodiment, the silicone:fragrance composition weight ratio is from 1:1 to 10:1. In a further preferred embodiment, the hair care preparation is a shampoo, a conditioner, or a conditioning shampoo.

The compositions of the invention may additionally be used in other cosmetic applications, in particular skin care applications, providing a similar benefit. Examples of suitable skin care applications include lotions, gels (including shower gels), jellies, pastes, facial applications, moisturizers, face masks, night creams, day creams, sun milk, massage creams, make-up removal lotions, anti-aging cream, and anti-wrinkle cream.

The following Examples are provided for a further illustration of the invention, but are not intended to be limiting thereof. Unless otherwise indicated, all parts and percentages are by weight and all viscosities are dynamic viscosities measured at 25 °C.

A silicone-in-water emulsion, SEM1, was made by mixing 58.5 parts dimethylvinyl-terminated polydimethylsiloxane having a viscosity of 55,000 mm²s^-1 with 1.17 parts of dimethylhydrogen-terminated polydimethylsiloxane having a viscosity of 10 mm²s^-1. To this mixture was added 2.05 parts of polyoxyethylene (3) lauryl ether and enough water to cause phase inversion. 2.8 parts of polyoxyethylene (23) lauryl ether were then added under high shear. Finally, water was added to a total of 35.5 parts water, in which the water was added in stages with mixing after each addition, followed by the addition of 0.012 parts of a platinum catalyst and 0.5 parts of Glydant Plus preservative. The resulting emulsion was a non-ionic emulsion containing about 60% by weight of a linear silicone polymer formed from the hydrosilylation of a Si-H end-blocked polydimethyl siloxane and a vinyl-end-blocked polydimethyl siloxane, in which the polymer has a viscosity of about 170 million mm ²s^-1 and an average particle size of 0.5 µm. The silicone-in-water emulsion formed, SEM1, was mixed with fragrances and tested as described in the following Examples.

Fragrance 862883 was mixed with the silicone-in-water emulsion, SEM1, in a 1:4 ratio by weight. The fragrance/silicone mixture was added at a concentration of 4% by weight to a shampoo base T-058.

Shampoo base T-058 is formed by mixing 0.30 % Metholcel E4M (hydroxypropyl methylcellulose; Dow Chemical Co.) in hot deionized water at 80 - 90 °C with an overhead mixer at medium speed until all of the particles are wetted down and a consistent dispersion is obtained. 0.05 % Sequestrene Na₄ (tetrasodium EDTA; Ciba Geigy) was mixed at 85 °C with deionized water, was cooled down, and added to the hot mixture. The resulting solution was cooled to 30 °C and mixing was continued for approximately 20 minutes. The mixture was reheated to 60 °C. 18.00 % Standapol T (TEA lauryl sulfate; Cognis/Henkel), 8.00 % Standapol A (ammonium lauryl sulfate; Cognis/Henkel), 4.00 % Monamid 150-LMWC (lauramide DEA; Uniqema), and 0.30 % Palmitic acid (Ruger) were added while mixing at low/medium speed using an overhead mixer. 0.15 % Gydant (DMDM hydantoin; Lonza), approximately 0.3 % sodium chloride (to adjust viscosity), and approximately 0.5 % citric acid (to adjust pH to 5.5-6.0) was added while mixing at low/medium speed using an overhead mixer. The mixture was mixed at low speed until room temperature was reached to form T-058.

As a control, fragrance alone was added at a concentration of 0.8% by weight to the same shampoo base T-058. The fragrance/silicone mixture and the control each were added to half a head of two subjects. The hair was shampooed and the fragrance was evaluated by a panel of five perfume and odor evaluators at the stages of neat products, hair during lathering, hair after rinsing, hair after blow drying, and hair 6 hours after drying. The evaluations were determined on a scale of 1-5 (1, no fragrance, to 5, strong fragrance smell) for each subject. The evaluations for the two subjects were averaged and the evaluation results are summarized in Table 4. Stage 4% fragrance/silicone mixture in shampoo base T-058 0.8 % fragrance mixture in shampoo base T-058 Neat 4.00 4.25 Lathering 3.25 2.75 Rinse 2.75 1.50 Blow-dry 2.50 1.75 6 hours after blow-dry 2.00 1.50

The results indicate that silicones have a significant effect on residual fragrance perception at the stages of lathering, rinse, blow-dry, and 6 hours after blow-dry.

Fragrance 862883 was mixed with the silicone-in-water emulsion, SEM1, in a 1:4 ratio by weight. The fragrance/silicone mixture was added at a concentration of 4% by weight to a shampoo base T-058 (see Example 2). As a control, fragrance alone was added at a concentration of 0.8% by weight to the same shampoo base T-058. The fragrance/silicone mixture and the control were added to 6 swatches of hair each. The 12 hair swatches were shampooed and the fragrance was evaluated by a panel of five perfume and odor evaluators at the stages of hair after rinsing, hair after blow drying, and hair 6 hours after drying. The evaluations were determined on a scale of 1-5 (1, no fragrance, to 5, strong fragrance smell) for each swatch. The evaluations by each evaluator and for all the swatches were averaged, and the evaluation results are indicated in Table 5. Stage 4% fragrance/silicone mixture in shampoo base T-058 0.8 % fragrance mixture in shampoo base T-058 Rinse 3.60 3.26 Blow-dry 3.02 2.75 6 hours after blow-dry 1.93 2.13

The results indicate that silicones have a positive effect on residual fragrance perception at the stages of after rinse and after blow-dry.

Fragrance 890656 was mixed with the silicone-in-water emulsion, SEM1, in a 1:8 ratio by weight. The fragrance/silicone mixture was added at a concentration of 3.2% by weight to a conditioner base T-114.

Conditioner base T-114 is formed by heating deionized water to 70 °C and slowing adding 0.25 % methyl paraben (TRI-K) while mixing at medium speed until completely solubilized. The resulting composition is held at 70 °C. 1.50 % propylene glycol and 1.00 % Natrosol 250 HR (hydroxythylcellulose; Hercules) are premixed into a slurry and added to the initial mixture. The resulting mixture is mixed at 70 °C until completely clear and hydrated. 1.00 % Ammonyx 4002 (stearalkonium chloride; Stephan) is slowly added to the mixture. 0.25 % Lipoquat R (ricinoleamidopropyl ethyldimonium ethosulfate; Lipo Chemicals, Inc.), 0.50 % Lipopeg 6000 DS (PEG-150 distearate; Lipo Chemicals, Inc.), 1.00 % Lipowax D (cetearyl alcohol and ceteareth-20; Lipo Chemicals, Inc.), and 0.10 % propyl paraben (TRI-K) were pre-heated until melted and clear and then added to the mixture while mixing on a homomixer at medium speed for 1 minute to form conditioner base T-114.

As a control, fragrance alone was added at a concentration of 0.4% by weight to the same conditioner base T-114. The fragrance/silicone mixture and the control were added to 6 swatches of hair each. The 12 hair swatches were conditioned and the fragrance was evaluated by a panel of five perfume and odor evaluators at the stages of hair after rinsing, hair after blow drying, and hair 6 hours after drying. The evaluations were determined on a scale of 1-5 (1, no fragrance, to 5, strong fragrance smell) for each swatch. The evaluations by each evaluator and for all the swatches were averaged and the evaluation results are indicated in Table 6. Stage 3.2% fragrance/silicone mixture in conditioner base T-114 0.4 %fragrance mixture in conditioner base T-114 Rinse 3.23 2.83 Blow-dry 2.68 2.42 6 hours after blow-dry 2.03 2.00

The results indicate that silicones have a positive effect on residual fragrance perception at the stages of after rinse and after blow-dry.

Fragrance 862883 was mixed with the silicone-in-water emulsion, SEM2. SEM2 was prepared in a similar manner as SEM1 described in Example 1, except that the non-ionic surfactants were replaced with 3.4 parts of Bioterge AS 40 (Stephan Company) and less dimethylhydrogen-terminated polydimethylsiloxane was used, resulting in an anionic emulsion having a polymer with a viscosity of 300 million mm²s^-1 and an average particle size of 1.1 µm. The emulsion and the fragrance were mixed in a 4:1 ratio by weight. The SEM2-based fragrance/silicone mixture was added at a concentration of 4% by weight to a shampoo base T-058 (see Example 2).

Fragrance 862883 was mixed with the silicone-in-water emulsion, SEM8. SEM8 was prepared in a similar manner as SEM1 described in Example 1, except that in addition, 4 parts of a alkylmethyl siloxane polymer of about 10 mm²s^-1 having a C₃₀ alkyl substituent on each silicon atom, was added. The emulsion had an average particle size of 0.8 µm. The emulsion was mixed with fragrance in a 4:1 ratio by weight. The SEM8-based fragrance/silicone mixture was added at a concentration of 4% by weight to a shampoo base T-058.

As a control, fragrance alone was added at a concentration of 0.8% by weight to the same shampoo base T-058. The fragrance/silicone mixtures and the control were added to 3 swatches of hair each. The 9 hair swatches were shampooed and the fragrance was evaluated by a panel of six perfume and odor evaluators at the stages of hair after rinsing, hair after blow drying, and hair 6 hours after drying. The evaluations were determined on a scale of 1-5 (1, no fragrance, to 5, strong fragrance smell) for each swatch. The evaluations by each evaluator and for all the swatches were averaged and the evaluation results are indicated in Table 7. Stage 4% SEM2-based fragrance/silicone mixture in shampoo base T-058 4% SEM8-based fragrance/silicone mixture in shampoo base T-058 0.4 % fragrance mixture in shampoo base T-058 Rinse 2.82 3.44 3.29 Blow-dry 2.00 2.71 2.74 6 hours after blow-dry 1.58 1.94 1.95

The results indicate that the SEM2 and SEM8-based mixtures do not have a consistent positive effect on residual fragrance perception.

Fragrance 862883 was mixed with the silicone-in-water emulsion, SEM1, in a 1;4 ratio by weight. The SEM1-based fragrance/silicone mixture was added at a concentration of 4% by weight to a shampoo base T-058 (see Example 2).

Fragrance 862883 was mixed with the silicone-in-water emulsion, SEM4, in a 1:4 ratio by weight. SEM4 was made in a similar way to SEM1 described in Example 1, however the resulting emulsion has a viscosity of 138 million mm²s^-1 and an average particle size of 0.35 µm. The SEM4-based fragrance/silicone mixture was added at a concentration of 4% by weight to a shampoo base T-058.

Fragrance 862883 was mixed with the silicone-in-water emulsion, SEM5, in a 1:4 ratio by weight. SEM5 was made in a similar fashion as SEM1 described in Example 1, but the resulting emulsion had a viscosity of 272 million mm²s^-1 and an average particle size of 0.36 µm. The SEM5-based fragrance/silicone mixture was added at a concentration of 4% by weight to a shampoo base T-058.

As a control, fragrance alone was added at a concentration of 0.8% by weight to the same shampoo base T-058. The fragrance/silicone mixtures and the control were added to 3 swatches of hair each. The 12 hair swatches were shampooed and the fragrance was evaluated by a panel of six perfume and odor evaluators at the stages of hair after rinsing, hair after blow drying, and hair 6 hours after drying. The evaluations were determined on a scale of 1-5 (1, no fragrance, to 5, strong fragrance smell) for each swatch. The evaluations by each evaluator and for all the swatches were averaged and the evaluation results are indicated in Table 8. Stage 4% SEM1-based fragrance/silicone mixture in shampoo base T-058 4% SEM4-based fragrance/silicone mixture in shampoo base T-058 4% SEM5-based fragrance/silicone mixture in shampoo base T-058 0.8 % fragrance mixture in shampoo base T-058 Rinse 3.72 3.36 3.58 3.10 Blow-dry 3.43 2.97 3.07 2.92 6 hours after blow-dry 2.11 1.83 2.03 1.64

The results indicate that the SEM1, SEM4, and SEM5-based mixtures all give a positive effect on residual fragrance perception. Furthermore, SEM1-based mixture give a better effect than SEM4 or SEM5-based mixtures.

Compositions of shampoo base T-058 alone or in combination with silicone-in-water emulsion SEM1 and/or fragrance 862883 were formulated according to the ingredients and amounts given in Table 9. The viscosity of the resulting compositions are shown in Table 9. Addition of silicone-in-water emulsion SEM1 to shampoo base T-058 reduced the viscosity of the shampoo base T-058 by about 15%. Addition of fragrance 862883 increased the viscosity of shampoo base T-058 over 2.5-fold. When added to shampoo base T-058, the combination of silicone-in-water emulsion SEM1 and fragrance 862883 exhibited a viscosity reduction of about 15%, relative to addition of fragrance 862883 alone. Composition Viscosity (cps) Shampoo base T-058 2020 Shampoo base T-058 + 3.2% silicone-in-water emulsion SEM1 1700 Shampoo base T-058+ 0.8% fragrance 862883 5450 Shampoo base T-058 + 3.2% silicone-in-water emulsion SEM1 + 4.0% fragrance 862883 4530

The present invention is not to be limited in scope by the specific embodiments described herein. Various modifications of the invention in addition to those described herein will become apparent to those skilled in the art from the foregoing description. Such modifications are intended to fall within the scope of the appended claims.